Mass Spectrometry and Infra-red Spectroscopy

Carbon-13 NMR

In C-13 nmr the environments in concern are those of the carbon atoms.

When looking at environments the entire chain branching off the carbon atom needs to be concerned.

C-13 is low resolution nmr as only one peak appears for each environment.

Different environments give different peaks on a spectrum. The list is given in the exam.

Ethane has one environment

There are two carbons with the same environments as the chains connected to the carbons are the same.

Propanal has three environments

There are three carbons but the chain coming from the carbons are not the same so they have an environment each.

Proton (H-1) NMR

Proton NMR looks for resonance of proton (Hydrogen) groups.

The entire chain is considered in the environment - when asked to show what group created a peak all the information known needs to be drawn out as a displayed formula including the amount of Hydrogens in each enviroment.

Proton NMR is high resolution spectroscopy.

Splitting Patterns

Every peak is split into either a singlet, doublet, triplet or quartet